DOI: 10.1002/2014GL061289
论文题名: Microphysical, radiative, and dynamical impacts of thin cirrus clouds on humidity in the tropical tropopause layer and lower stratosphere
作者: Dinh T. ; Fueglistaler S.
刊名: Geophysical Research Letters
ISSN: 0094-9712
EISSN: 1944-9443
出版年: 2014
卷: 41, 期: 19 起始页码: 6949
结束页码: 6955
语种: 英语
英文关键词: cirrus clouds
; dehydration
; humidity
; ice
; tropical tropopause layer
; water vapor
Scopus关键词: Atmospheric humidity
; Dehydration
; Efficiency
; Ice
; Tropics
; Water vapor
; Cirrus clouds
; Cloud microphysics
; Dehydration efficiency
; Induced temperature
; Lower stratosphere
; Model configuration
; Temperature increase
; Tropical tropopause layers
; Clouds
; cirrus
; cloud microphysics
; cloud radiative forcing
; humidity
; simulation
; tropical environment
; tropopause
英文摘要: Cloud-resolving numerical simulations are carried out to study how in situ formed cirrus affect the humidity in the tropical tropopause layer and lower stratosphere. Cloud-induced impacts on the specific humidity are evaluated separately in terms of (i) the dehydration efficiency and (ii) the increase in the saturation mixing ratio associated with cloud radiatively induced temperature adjustment. The numerical results show that the dehydration efficiency of cirrus clouds, which is measured by the domain average relative humidity, varies within 100 ± 15% in all model configurations (with/without heterogeneous ice nucleation and with/without cloud radiative heating and cloud dynamics). A larger impact on the specific humidity comes from temperature increase (of a few kelvins) induced by cloud heating. The latter is found to scale approximately linearly with the domain average ice mass. Resolving the cloud radiatively induced circulations approximately doubles the domain average ice mass and associated cloud-induced temperature change. Key Points Dehydration efficiency has less impact than cloud-induced temperature changes on the specific humidity profileImportance of cloud-scale dynamicsInteractions between cloud microphysics, radiation, and dynamics ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911167098&doi=10.1002%2f2014GL061289&partnerID=40&md5=d2ea7b3a9d91156d5a7da21acda12c7e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6976
Appears in Collections: 气候减缓与适应
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作者单位: Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
Recommended Citation:
Dinh T.,Fueglistaler S.. Microphysical, radiative, and dynamical impacts of thin cirrus clouds on humidity in the tropical tropopause layer and lower stratosphere[J]. Geophysical Research Letters,2014-01-01,41(19).